.login {
  position: relative;
  height: 100%;
  background-image: url('https://middle-file.oss-cn-shanghai.aliyuncs.com/image/57a7a25c31424dd5b891319525045348.jpg?Expires=29347977600&OSSAccessKeyId=LTAI5tCEdfEG5qJftWaqbykQ&Signature=tUi7rVnCVvMGFiyic%2FE3sLENSXU%3D');
  background-position: center;
}
.login > div {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  padding: 20px;
  text-align: center;
  max-width: 500px;
  min-width: 300px;
}
h2 {
  color: #fff;
  padding: 40px;
}
